Crossfall — Road Example

Incorrect Crossfall

Crossfall controls the change in level across a road, path or other surface. A correct centreline does not prove that the edges drain correctly.

Before moving material

Measure the cross-section at the affected location.

Receiving operation and checks

Check the corrected section and the neighbouring transition sections. Verify both edges and any gutter or drain connection.

Do not infer a road crossfall specification from a generic illustration.

Road Corrugations

Road corrugations concern both the wearing material and traffic interaction. Dragging loose peaks into hollows can improve appearance temporarily while leaving the cause unchanged.

Before moving material

Assess aggregate condition, drainage and the depth of the corrugated layer.

Receiving operation and checks

Compact and manage traffic as required by the road-maintenance plan. Check that the profile and edge drainage are restored.

Persistent corrugation may need material or maintenance-method changes.

How to Prepare Subgrade for Road Base

Before road base is placed, the subgrade should be accepted for both level and condition. An uneven or weak supporting surface can lead to thickness variation and premature failure above it.

Before moving material

Confirm formation level and identify unaccepted areas.

Receiving operation and checks

Inspect and accept before spreading base aggregate. Record level and material checks for the same work area.

Adding more base material is not automatically a remedy for weak subgrade.

Record the job inputs

Use this checklist to turn the scenario into a specific brief. Retain the design revision and agree who accepts each completed layer.

• Existing condition, extent and the reason for intervention
• Required finished purpose, receiving operation and acceptance criteria
• Material type, layer role, source, receiving area and volume state
• Reference levels, datum, survey method and issued design revision
• Available tractor, implement configuration, travel route and turning space
• Checks before work, stopping points and evidence retained at handover

Checklist ticks apply only while this page is open. Include the completed brief in your project records.

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